Pressure-governor.



No. 686,396. 4Patented Nov. l2, |90l. D. DNOHUE. PRESSURE GOVERNOR.

(Application led Apr. 17. 1901.1

(No Modal.)

' .warmeys H NUHli PETERS CU PHOTO-DYMO.. WASHINGTON, D. C.

NiT-ED STATES DANIEL DONOHUE, OF BUFFALO, NEW YORK.

PRESSURE-GOVERNOR.

SPECIFICATION forming part of Letters :Patent o. 686,396, dated November 12, 1 901.

Application ined April 17, 1901.

T0 a/ZZ whom; iz'; may concern:

Be it.known that I, DANIEL DONOHUE, a citizen ofl the United Statesresiding at the city of Bualo, in the county of Erie and State of New York, have invented a new and useful Improvement in Pressure-Governors, of which the following is a specification.

This invention relates to a pressure regulator or governor intended more especially for throttling the steam-supply of a pump which draws Huid from a variable or irregular source, such as an oil-storage tank or the bilge-water of a vessel.

The object of my invention is the construetion of a simple regulator of this character which is reliable in action.

In the accompanying drawings, Figure lis a side elevation of a steam-pump provided with my improved regulator. Fig. 2 is a vcrtical longitudinal section of the regulator on an enlarged scale. Fig. 3 is a transverse vertical section in line 3 3, Fig. 2. Fig. 4 is a vertical longitudinal section, on a reduced scale, of a slightly-modified construction of` the regulator. v

Like letters of reference refer to like parts in the several figures.

A is the steam-cylinder, A' the steam-chest, A2 the pump-cylinder, and A3 the suctionpipe, of an ordinary steam-pump.

B is the case of the regulator, closedat its ends by heads b and provided onopposite sides between its ends with steam inlet and outlet branches b' b2, which are connected by pipes C C' with a steam-boiler and the steam-chest of the pum p, respectively.

D is a valve-chamber or double diaphragm arranged transversely in the central portion of the case B in line with the inlet branch b', and communicating at its upper end with the steam-supply pipe C. This valve-chamber is closed at its bottom and sides and provided in its front and rear Walls with ports cl,through which the steam passes into the main chamber'of the regulator. These ports have suitable valve-seats. The bottom of the valvechamber D is separated from the bottom of the case by passages e, which connect the main chamber of the case with the outlet-pipe C.

F isaduplex or balanced valve applied to the portsd and controlling the passage of the steam from the valve-chamber D into the sans No. 56,286. (No moan.:-

body of the regulator. To insure a simultaneous seating of the heads of this balanced pistons G G', of differential sizes or areas, the

portions of the regulator-case in which these pistons slide being constructed of correspondingly-different diameters.

H is a resisting-spring interposed between the rear side of the large piston G and an adjustable follower I, arranged in the case B and tending to open the throttle-valve F. AIn

the construction shown in the drawings the followerI is provided with an adj usting-screw i, which passes through a screw threaded opening formed in the adjacent head of the case and terminates in a hand-wheel for turning it. This follower may be adjusted by any other suitable means, if desired.

J is an exhaust or vacuum pipe leading from the suction-pipe A3 or the suction-chamber of the pump to the portion of the regulator-case B behind. its small piston G. The current of liquid through the suction-pipe oi' the pump tends to exhaust the air from the portion of the regulator-case behind the small piston G'.

In the operation of the regulator the steam entering its valve-chamber D passes through the openports d into the portion of the regulator between the pistons G G', and thence into and through the outlet-pipe O'v to the pump. The steam-pressure is exerted against A the faces of both pistons G G', and owing to Ythe greater area of the large piston the pressure against the same preponderates over that against the small piston, causing the duplex throttle-Valve F to be shifted toward its seats and cutting off the steam-supply to the pump more or less. The closing of the throttlevalve by the steam-pressure is opposed by the spring II and also by the vacuum on the rear side of the small piston G', the tension of this spring being regulated to furnish the necessary resistance for reducing the pressure to the desired normal. As the steam-pres- IOC sure fluctuates the throttle-valve F is automatically opened and closed more or less, supplying steam to the pump at a practically uniform pressure. Vhen the load is removed fromythe pump by the exhaustion of its source of supply, the pump draws air through its suction-pipe A3, and a portion of the air passes through the exhaust-pipe J and enters the regulator-ease behind the small piston GQ destroying the partial vacu um therein. This correspondingly reduces the resistance upon the throttle-valve encountered by the steam-pressure, and the pressure against the large piston G now overbalances the pressure against the small piston and nearly closes the throttle-valve, thereby. preventing racing of the pump when the same runs without a load. The pump continues to run slowly until the bilge-Water or other fluid again rises to or above the level of its suction-pipe, when the air is again exhausted from behind the small piston G', thus again increasing the resistance to the steam-pressure, allowing the spring H to open the throttle-valve wider and supplying the necessary pressure for the increased load of the pump.

In the modified construction shown in Fig. et the valve-stem f is provided with a single throttle-valve F', and in this case the valvechamber D has but one exit-port d'.

If desired, my improved regulator may in some cases be used without the exhaust-pipe J. Vhen this pipe is omitted, the closing movement of the throttle-valve is resisted by the spring H alone.

The portion or cylinder of the regulatorcase which contains the small piston G is preferably made removable, and the small piston is also removably applied to the valvestem f to enable this piston to be replaced by one of greater or smaller diameter relatively to the large piston G for obtaining the desired differential ratio between the pistons.

I claim as my inventionl. In a pressure-regulator, the combination with a case having an inlet and an outlet, and a diaphragm separating the inlet from the outlet and having a port, of a throttle-valve controlling said port, pistons of differential areas connected with said valve and having their opposing faces exposed to the pressure in the case, a yielding resistance arranged to oppose the closing movement of said valve, an exhaust device, and a pipe connecting the portion of the case behind said small piston with said exhaust device, substantially as set forth.

2. The combination with a pump and its suction-pipe, of a pressure-regulator comprising a case having an inlet, and an outlet connected with the steam-cylinder of the pump, a diaphragm separating said inlet from said outlet and having a port, a throttlc-valve controlling said port, pistons of differential areas connected with said valve and having their opposing faces exposed to the pressure in the regulator-case, and an exhaust-pipe connecting the suction-pipe of the pump with the portion of the regulator-case behind its small piston, substantially as set forth.

3. The combination with a pump and its suction-pipe, of a pressure-regulator comprising a easing having an inlet, andan ontlet connected with the steam-cylinder of the pump, a diaphragm separating said inlet from said outlet and having a port, a throttle-valve controlling said port, pistons of differential areas connected with said valve and having their opposing faces exposed to the pressurein the regulator-ease, an exhaustpipe connecting the suction-pipe of the'pump with the portion of said case behind its small piston, and a resisting-spring bearing against the rear side of the large piston of the case, substantially as set forth.

4. The combination with a pump and its suction-pipe, of a pressure-regulator comprising a casing having an inlet and an outlet connected with the steam-cylinder of the pump, a diaphragm separating said inlet from said outlet and having a port, a throttle-valve controlling said port, pistons of different areas connected with said valve on opposite sides of said diaphragm, an exhaustpipe connecting the suction-pipe of the pump with the portion of said case behind its small piston, an adjustable follower arranged behind said large piston, and a spring interposed between said large piston and said follower, substantially as set forth.

Witness my hand this 13th day of April, 1901.

DANIEL DONOHUE.

Witnesses:

THEO. L. PoPP, ARTHUR H. PoPP.

IOO 

